1. Postdoctoral Fellow, Hydrogeology and Water Resources, International Water Management Institute, Private Bag X813, Silverton, Pretoria 0127, South Africa (corresponding author).
2. Associate Professor, Hydroinformatics, Dept. of Integrated Water Systems and Governance, UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX Delft, Netherlands.
3. Assistant Professor, Water Resources Management, Dept. of Soils, Water and Agricultural Engineering, Sultan Qaboos Univ., P.O. Box 34, Al Khawd 123, Muscat, Oman.
4. Associate Professor, Water Resources Management, Dept. of Soils, Water and Agricultural Engineering, Sultan Qaboos Univ., P.O. Box 34, Al Khawd 123, Muscat, Oman.
5. Professor, Hydraulic Engineering, UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX Delft, Netherlands; and Head, Dept. of Water Science Engineering, Delft Univ. of Technology, Faculty CiTG, P.O. Box 5048, 2600 GA Delft, Netherlands.